Thermoelectric power generation device manufacturing method

Abstract

The invention discloses a manufacturing method of a thermoelectric power generation device, and aims to overcome the defects that the existing thermoelectric power generation device is low in tolerable temperature and affects the power generation efficiency. The method comprises the following steps: S1, attaching a protective layer to the surface of a thermoelectric material, and cutting the thermoelectric material to form thermoelectric particles; s2, arranging and placing the thermoelectric particles in a positioning mold; s3, pouring heat-resistant fixing liquid into the positioning mold, and forming a semi-finished product after the heat-resistant fixing liquid is solidified; s4, processing the surface of the semi-finished product to expose thermoelectric particle end faces; and S5, welding frames are connected to the two sides of the semi-finished product correspondingly, a plurality of grooves are formed in the welding frames, and the molten ZnAl welding paste is poured into the grooves to achieve welding between the thermoelectric particles. The prepared thermoelectric power generation device is high in temperature tolerance, the power generation efficiency and adaptability of the product are improved, and commercial application of the thermoelectric power generation device is promoted.

Description

Technical Field

[0001] This invention relates to the field of thermoelectric semiconductor technology, and more specifically, to a method for manufacturing a thermoelectric power generation device. Background Technology

[0002] Semiconductor-cooled chip power generation is a novel method of energy generation. Its principle utilizes the thermoelectric effect of semiconductor materials. When the temperatures at both ends of a semiconductor material are different, a potential difference is generated, thus producing an electric current. Semiconductor-cooled chip power generation is highly efficient, environmentally friendly, and safe. It produces no pollutants during the power generation process and has no impact on the environment. It does not require the combustion of any fuel, therefore eliminating the safety hazards of fire and explosion. The applications of semiconductor-cooled chip power generation are very wide-ranging. It can be used for the conversion of various energy sources, including solar, geothermal, and biomass energy. As a highly efficient, environmentally friendly, and safe new energy source, semiconductor-cooled chip power generation will see wider application and promotion.

[0003] Currently, bismuth telluride-based power generation applications still suffer from low conversion efficiency. Furthermore, the efficiency of thermoelectric power generation modules depends on temperature differences. Traditional TEG (thermoelectric generator) systems employ solder brazing technology, but mass-producible solders such as SAC, 95Sn5Sb, and AuSn only have melting points around 200 degrees Celsius. The hot end can only operate at a maximum temperature of around 200-230 degrees Celsius, and the temperature drop is significant, limiting the commercialization and use of thermoelectric power generation modules. Chinese patent application number 2011100095050 discloses a method for manufacturing a high-temperature resistant thermoelectric device. During use, even if the hot end temperature exceeds the melting point of the solder, causing the solder at the joint to melt, the device can still operate reliably due to the surrounding sealant, greatly increasing the maximum temperature that the hot end of the thermoelectric device can withstand. Although the surrounding sealant can reduce the temperature of the solder, the effect is limited, and the hot end's high-temperature resistance is poor, with significant temperature drop. Summary of the Invention

[0004] To overcome the above shortcomings, the present invention provides a method for manufacturing a thermoelectric power generation device. The resulting thermoelectric power generation device has high temperature resistance, improves the power generation efficiency of the product, and is conducive to promoting its commercial application.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a method for manufacturing a thermoelectric power generation device, comprising the following steps: S1, attaching a protective layer to the surface of a thermoelectric material and cutting the thermoelectric material to form thermoelectric particles; S2, arranging the thermoelectric particles in a positioning mold; S3, pouring a heat-resistant fixing liquid into the positioning mold, and forming a semi-finished product after the heat-resistant fixing liquid solidifies; S4, processing the surface of the semi-finished product to expose the end faces of the thermoelectric particles; S5, connecting welding frames to both sides of the semi-finished product, setting several grooves on the welding frames, and pouring molten ZnAl solder paste into the grooves to achieve welding between the thermoelectric particles.

[0006] In this application, a protective layer is attached to the surface of the thermoelectric material, which protects the thermoelectric material and improves its thermoelectric performance. After the thermoelectric particles are aligned, a heat-resistant fixing liquid is poured in. After the heat-resistant fixing liquid solidifies, it positions the thermoelectric particles, ensuring the accuracy of their position. Moreover, the heat-resistant fixing liquid is resistant to high temperatures, enabling the thermoelectric power generation device to withstand higher temperatures, thereby improving power generation efficiency. Molten ZnAl solder paste is poured into the groove to weld the thermoelectric particles. The high melting point of ZnAl solder helps to improve the product's temperature resistance, increase the temperature difference of the product, and improve the product's power generation efficiency and adaptability.

[0007] The thermoelectric power generation device manufactured by this patent has high temperature resistance, which improves the power generation efficiency and adaptability of the product and is conducive to promoting its commercial application.

[0008] Preferably, electrode patches are attached to the surface of the semi-finished product after S4.

[0009] Electrode patches are attached to the surface of the semi-finished product to facilitate the electrical connection of thermoelectric particles.

[0010] Preferably, the protective layer comprises a nickel layer and an aluminum layer, with the aluminum layer covering the nickel layer. The nickel layer has a thickness of 10-100 μm; the aluminum layer has a thickness of 10-200 μm.

[0011] The nickel layer can quickly form a protective film on the surface of thermoelectric particles, providing excellent protection for them, while the aluminum layer serves to conduct electricity and heat and provide structural support.

[0012] Preferably, a sinking groove is provided on the positioning mold, and several positioning grooves are provided at the bottom of the sinking groove. The positioning grooves are compatible with the thermoelectric particles. A lifting block is provided at the bottom of the positioning groove, and a lifting plate is provided below the positioning mold. The lifting block is connected to the lifting plate through a connecting rod. S2 The thermoelectric particles are placed in the positioning groove. S3 After the heat-resistant fixing liquid is poured out, the lifting plate is raised and the lifting block pushes the thermoelectric particles to rise so that the thermoelectric particles are completely immersed in the heat-resistant fixing liquid.

[0013] A positioning groove adapted to the thermoelectric particles is set in the settling tank. The thermoelectric particles are placed in the positioning groove, and they will not move during the pouring of the heat-resistant fixing liquid, ensuring precise positioning. Before the heat-resistant fixing liquid solidifies, the lifting plate rises, pushing the lifting block upwards, thereby pushing the thermoelectric particles away from the positioning groove and ensuring that the thermoelectric particles are completely immersed in the heat-resistant fixing liquid, guaranteeing reliable positioning of the thermoelectric particles in the fixing liquid. After the solidified semi-finished product is removed from the positioning mold, the lifting plate and lifting block return to their original positions.

[0014] Preferably, S4 uses grinding or milling to process the surface of the semi-finished product.

[0015] Grinding or milling is used to process the surface of the semi-finished product to remove excess heat-resistant fixing liquid, thereby exposing the end face of the thermoelectric particles, which facilitates the subsequent connection of the thermoelectric particles.

[0016] As a preferred option, the heat-resistant fixing liquid is gypsum solution.

[0017] Gypsum has a refractoriness of over 1,000 degrees Celsius. The thermoelectric particles are fixed after the gypsum liquid solidifies, which makes the product have a high temperature resistance.

[0018] Preferably, the protective layer is attached to the surface of the thermoelectric material by any of the following processing methods: dip plating, electroplating, spraying, or sputtering vacuum plating.

[0019] The protective layer can be processed in various ways, allowing for greater flexibility by choosing any processing method.

[0020] Preferably, the thermoelectric material is any one of bismuth telluride, lead telluride, or tin selenide.

[0021] Bismuth telluride, lead telluride, and tin selenide are used as thermoelectric materials, resulting in good thermoelectric performance.

[0022] Preferably, the welding frame is made of gypsum board.

[0023] Gypsum has a high refractory temperature, which improves the product's temperature resistance.

[0024] Compared with the prior art, the beneficial effects of the present invention are: (1) The thermoelectric power generation device made by this patent has high temperature resistance, which is conducive to improving the power generation efficiency and adaptability of the product and accelerating its commercial application process; (2) After the heat-resistant fixing liquid solidifies, it positions the thermoelectric particles to ensure the accuracy of the position of the thermoelectric particles. Moreover, the heat-resistant fixing liquid is resistant to high temperature, which enables the thermoelectric power generation device to withstand higher temperatures, thereby improving the power generation efficiency; (3) ZnAl solder realizes the welding between thermoelectric particles. ZnAl solder has a high melting point, which is conducive to improving the temperature resistance of the product, increasing the temperature difference of the product, and improving the power generation efficiency and adaptability of the product; (4) A positioning groove adapted to the thermoelectric particles is set in the sink. The thermoelectric particles are placed in the positioning groove. During the process of pouring the heat-resistant fixing liquid, the thermoelectric particles in the positioning groove will not move, ensuring the accuracy of the position. Attached Figure Description

[0025] Figure 1 This is a structural diagram of the thermoelectric power generation device obtained by the present invention.

[0026] Figure 2 This is a cross-sectional view of the thermoelectric power generation device obtained by the present invention.

[0027] Figure 3 This is an exploded view of the thermoelectric power generation device obtained by the present invention.

[0028] Figure 4 This is a structural diagram of the positioning mold of the present invention.

[0029] Figure 5 This is a structural diagram of the positioning base according to Embodiment 2 of the present invention.

[0030] Figure 6 This is a structural diagram of the positioning base in Embodiment 3 of the present invention.

[0031] Figure 7 This is a side view of the positioning base in Embodiment 3 of the present invention.

[0032] In the diagram: 1. N-type thermoelectric particle, 2. P-type thermoelectric particle, 3. Positioning mold, 4. Sinking groove, 5. Positioning groove, 6. Lifting block, 7. Lifting plate, 8. Connecting rod, 9. Lifting piston cylinder, 10. Semi-finished product, 11. Welding frame, 12. Groove, 13. Positioning base, 14. Mounting groove, 15. Welded body, 16. Positioning frame, 17. Active flipping bar, 18. Driven flipping bar, 19. Clamping groove, 20. Support frame, 21. Flipping motor, 22. Drive shaft, 23. Driven shaft, 24. Driven gear, 25. Driven gear, 26. Guide platform. Detailed Implementation

[0033] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: A method for manufacturing a thermoelectric power generation device (see Figure 1 , Figure 2 , Figure 3 , Figure 4 The process includes the following steps: S1, attaching a protective layer to the surface of the thermoelectric material and cutting the thermoelectric material to form thermoelectric particles; the thermoelectric material is any one of bismuth telluride, lead telluride, and tin selenide. In this embodiment, bismuth telluride is used as the thermoelectric material. The thermoelectric material is cut to prepare wafers with a thickness of 0.2~3mm, and then a protective layer is attached to the surface of the thermoelectric material. The protective layer is attached to the surface of the thermoelectric material by any one of the following processing methods: dip plating, electroplating, spraying, sputtering vacuum plating. In this embodiment, a spraying method is used for surface treatment. The protective layer includes a nickel layer and an aluminum layer, with the aluminum layer covering the nickel layer. First, the nickel layer is sprayed, with a thickness of 10-100μm; then, the aluminum layer is sprayed, with a thickness of 10~200μm. The wafers with the protective layer attached to the surface are diced to prepare grains with a width of 0.2~3mm to form thermoelectric particles. N-type thermoelectric particles 1 and P-type thermoelectric particles 2 are processed using N-type thermoelectric material and P-type thermoelectric material, respectively.

[0034] S2, arrange the thermoelectric particles into the positioning mold 3; arrange them in an alternating order of N-type thermoelectric particles 1 and P-type thermoelectric particles 2. A sinking groove 4 is provided on the positioning mold 3, and several positioning grooves 5 are provided at the bottom of the sinking groove 4. Each positioning groove 5 corresponds to a thermoelectric particle, and the positioning grooves 5 and thermoelectric particles are adapted to each other. A lifting block 6 is provided at the bottom of the positioning groove 5, and a lifting plate 7 is provided below the positioning mold 3. The lifting block 6 is connected to the lifting plate 7 via a connecting rod 8; the lifting plate 7 is connected to the extension rod of the lifting piston cylinder 9, and the lifting piston cylinder 9 drives the lifting plate 7 to move up and down. When the lifting block 6 is in a low position, there is a gap between the upper end of the lifting block 6 and the opening of the positioning groove 5. When the lifting block 6 is in a high position, the upper surface of the lifting block 6 is not lower than the bottom surface of the sinking groove 4. S2, the thermoelectric particles are placed into the positioning grooves 5; at this time, the lifting block 6 is in a low position, the lower part of the thermoelectric particles is placed in the positioning grooves 5, and the lower end of the thermoelectric particles is supported on the lifting block 6.

[0035] S3. A heat-resistant fixing liquid is poured into the positioning mold 3. After solidification, the heat-resistant fixing liquid forms a semi-finished product 10. The heat-resistant fixing liquid is gypsum liquid. The refractory temperature of gypsum can reach over 1000 degrees Celsius. After solidification, the gypsum liquid fixes the thermoelectric particles, making the product have high temperature resistance. After the heat-resistant fixing liquid is poured in S3, the lifting piston cylinder 9 drives the lifting plate 7 to move. The lifting plate 7 rises and pushes the thermoelectric particles up through the lifting block 6, so that the thermoelectric particles are completely immersed in the heat-resistant fixing liquid. A positioning groove 5 adapted to the thermoelectric particles is set in the sinking tank 4. The thermoelectric particles are placed in the positioning groove 5. During the pouring of the heat-resistant fixing liquid, the thermoelectric particles in the positioning groove 5 will not move, ensuring the accuracy of the position. Before the heat-resistant fixing liquid solidifies, the lifting plate 7 rises upward, pushing the lifting block 6 upward, thereby pushing the thermoelectric particles away from the positioning groove 5, so that the thermoelectric particles are completely immersed in the heat-resistant fixing liquid, ensuring that the thermoelectric particles are reliably positioned in the fixing liquid. After the solidified semi-finished product 10 is removed from the positioning mold 3, the lifting plate 7 and the lifting block 6 return to their original positions.

[0036] S4. Processing the surface of semi-finished product 10 to expose the end faces of the thermoelectric particles: Grinding or milling is used to process the surface of semi-finished product 10 to remove excess heat-resistant fixing liquid, thereby exposing the end faces of the thermoelectric particles to facilitate subsequent connection of the thermoelectric particles. After S4, electrode patches are attached to the surface of semi-finished product 10. The electrode patches are plaster electrode patches, which are prepared by mold and then attached to the surface of semi-finished product 10 with water to facilitate the electrical connection of the thermoelectric particles.

[0037] S5, welding frames 11 are connected to both sides of the semi-finished product 10. The welding frames 11 are made of plaster and are applied to the surface of the semi-finished product 10 with water. Several grooves 12 are set on the welding frames 11. Molten ZnAl solder paste is poured into the grooves 12 to achieve welding between thermoelectric particles. During welding, molten ZnAl solder paste is first poured into the groove 12 on one side of the welding frame 11 for welding. After cooling, molten ZnAl solder paste is poured into the groove 12 on the other side of the welding frame 11 for welding. After cooling, the outer surface of the welding frame 11 is processed to remove excess solder paste. The surface of the welding frame 11 is processed by grinding or milling.

[0038] In this application, a protective layer is attached to the surface of the thermoelectric material, which protects the thermoelectric material and improves its thermoelectric performance. After the thermoelectric particles are aligned, a heat-resistant fixing liquid is poured in. After the heat-resistant fixing liquid solidifies, it positions the thermoelectric particles, ensuring the accuracy of their position. Moreover, the heat-resistant fixing liquid is resistant to high temperatures, enabling the thermoelectric power generation device to withstand higher temperatures, thereby improving power generation efficiency. Molten ZnAl solder paste is poured into the groove 12 to achieve welding between the thermoelectric particles. The high melting point of ZnAl solder helps to improve the product's temperature resistance, increase the product's temperature difference, and improve the product's power generation efficiency and adaptability.

[0039] Example 2: A method for manufacturing a thermoelectric power generation device (see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The process includes the following steps: S1, attaching a protective layer to the surface of the thermoelectric material and cutting the thermoelectric material to form thermoelectric particles; the thermoelectric material is any one of bismuth telluride, lead telluride, and tin selenide. In this embodiment, bismuth telluride is used as the thermoelectric material. The thermoelectric material is cut to prepare wafers with a thickness of 0.2~3mm, and then a protective layer is attached to the surface of the thermoelectric material. The protective layer is attached to the surface of the thermoelectric material by any one of the following processing methods: dip plating, electroplating, spraying, sputtering vacuum plating. In this embodiment, a spraying method is used for surface treatment. The protective layer includes a nickel layer and an aluminum layer, with the aluminum layer covering the nickel layer. First, the nickel layer is sprayed, with a thickness of 10-100μm; then, the aluminum layer is sprayed, with a thickness of 10~200μm. The wafers with the protective layer attached to the surface are diced to prepare grains with a width of 0.2~3mm to form thermoelectric particles. N-type thermoelectric particles 1 and P-type thermoelectric particles 2 are processed using N-type thermoelectric material and P-type thermoelectric material, respectively.

[0040] S2, arrange the thermoelectric particles into the positioning mold 3; arrange them in an alternating order of N-type thermoelectric particles 1 and P-type thermoelectric particles 2. A sinking groove 4 is provided on the positioning mold 3, and several positioning grooves 5 are provided at the bottom of the sinking groove 4. Each positioning groove 5 corresponds to a thermoelectric particle, and the positioning grooves 5 and thermoelectric particles are adapted to each other. A lifting block 6 is provided at the bottom of the positioning groove 5, and a lifting plate 7 is provided below the positioning mold 3. The lifting block 6 is connected to the lifting plate 7 via a connecting rod 8; the lifting plate 7 is connected to the extension rod of the lifting piston cylinder 9, and the lifting piston cylinder 9 drives the lifting plate 7 to move up and down. When the lifting block 6 is in a low position, there is a gap between the upper end of the lifting block 6 and the opening of the positioning groove 5. When the lifting block 6 is in a high position, the upper surface of the lifting block 6 is not lower than the bottom surface of the sinking groove 4. S2, the thermoelectric particles are placed into the positioning grooves 5; at this time, the lifting block 6 is in a low position, the lower part of the thermoelectric particles is placed in the positioning grooves 5, and the lower end of the thermoelectric particles is supported on the lifting block 6.

[0041] S3. A heat-resistant fixing liquid is poured into the positioning mold 3. After solidification, the heat-resistant fixing liquid forms a semi-finished product 10. The heat-resistant fixing liquid is gypsum liquid. The refractory temperature of gypsum can reach over 1000 degrees Celsius. After solidification, the gypsum liquid fixes the thermoelectric particles, making the product have high temperature resistance. After the heat-resistant fixing liquid is poured in S3, the lifting piston cylinder 9 drives the lifting plate 7 to move. The lifting plate 7 rises and pushes the thermoelectric particles up through the lifting block 6, so that the thermoelectric particles are completely immersed in the heat-resistant fixing liquid. A positioning groove 5 adapted to the thermoelectric particles is set in the sinking tank 4. The thermoelectric particles are placed in the positioning groove 5. During the pouring of the heat-resistant fixing liquid, the thermoelectric particles in the positioning groove 5 will not move, ensuring the accuracy of the position. Before the heat-resistant fixing liquid solidifies, the lifting plate 7 rises upward, pushing the lifting block 6 upward, thereby pushing the thermoelectric particles away from the positioning groove 5, so that the thermoelectric particles are completely immersed in the heat-resistant fixing liquid, ensuring that the thermoelectric particles are reliably positioned in the fixing liquid. After the solidified semi-finished product 10 is removed from the positioning mold 3, the lifting plate 7 and the lifting block 6 return to their original positions.

[0042] S4. Processing the surface of semi-finished product 10 to expose the end faces of the thermoelectric particles: Grinding or milling is used to process the surface of semi-finished product 10 to remove excess heat-resistant fixing liquid, thereby exposing the end faces of the thermoelectric particles to facilitate subsequent connection of the thermoelectric particles. After S4, electrode patches are attached to the surface of semi-finished product 10. The electrode patches are plaster electrode patches, which are prepared by mold and then attached to the surface of semi-finished product 10 with water to facilitate the electrical connection of the thermoelectric particles.

[0043] S5, welding frames 11 are connected to both sides of the semi-finished product 10. The welding frames 11 are made of gypsum material. The welding frames 11 are attached to the surface of the semi-finished product 10 with water. Several grooves 12 are set on the welding frames 11. Molten ZnAl welding paste is poured into the grooves 12 to achieve welding between thermoelectric particles.

[0044] The welding frame 11 and the semi-finished product 10 are connected on the positioning base 13. The positioning base 13 is provided with a recessed mounting groove 14, which is adapted to the semi-finished product 10. The depth of the mounting groove 14 is greater than the thickness of the semi-finished product 10 plus the thickness of the welding frame 11. A through hole is provided at the bottom of the mounting groove 14 to facilitate the removal of the semi-finished product 10. In step S5, the semi-finished product 10 is first placed in the mounting groove 14, and then the welding frame 11 is placed on top of the semi-finished product 10. The welding frame 11 is adapted to be installed in the mounting groove 14. Molten ZnAl solder paste is poured into the groove 12 on the welding frame 11 for welding. After cooling, the connected semi-finished product 10 and welding frame 11 are removed, flipped, and then loaded into the mounting groove 14. At this time, the semi-finished product 10 is on top. Another welding frame 11 is placed on the semi-finished product 10. The other welding frame 11 is adapted to be installed in the mounting groove 14. Molten ZnAl solder paste is poured into the groove 12 on the other welding frame 11 for welding. After cooling, remove the two welded frames 11 and process the outer surfaces to remove excess solder paste. The surfaces of the welded frames 11 are processed by grinding or milling.

[0045] In this application, a protective layer is attached to the surface of the thermoelectric material, which protects the thermoelectric material and improves its thermoelectric performance. After the thermoelectric particles are aligned, a heat-resistant fixing liquid is poured in. After the heat-resistant fixing liquid solidifies, it positions the thermoelectric particles, ensuring the accuracy of their position. Moreover, the heat-resistant fixing liquid is resistant to high temperatures, enabling the thermoelectric power generation device to withstand higher temperatures, thereby improving power generation efficiency. Molten ZnAl solder paste is poured into the groove 12 to achieve welding between the thermoelectric particles. The high melting point of ZnAl solder helps to improve the product's temperature resistance, increase the product's temperature difference, and improve the product's power generation efficiency and adaptability.

[0046] Example 3: A method for manufacturing a thermoelectric power generation device (see Example 4) Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7The process includes the following steps: S1, attaching a protective layer to the surface of the thermoelectric material and cutting the thermoelectric material to form thermoelectric particles; the thermoelectric material is any one of bismuth telluride, lead telluride, and tin selenide. In this embodiment, bismuth telluride is used as the thermoelectric material. The thermoelectric material is cut to prepare wafers with a thickness of 0.2~3mm, and then a protective layer is attached to the surface of the thermoelectric material. The protective layer is attached to the surface of the thermoelectric material by any one of the following processing methods: dip plating, electroplating, spraying, sputtering vacuum plating. In this embodiment, a spraying method is used for surface treatment. The protective layer includes a nickel layer and an aluminum layer, with the aluminum layer covering the nickel layer. First, the nickel layer is sprayed, with a thickness of 10-100μm; then, the aluminum layer is sprayed, with a thickness of 10~200μm. The wafers with the protective layer attached to the surface are diced to prepare grains with a width of 0.2~3mm to form thermoelectric particles. N-type thermoelectric particles 1 and P-type thermoelectric particles 2 are processed using N-type thermoelectric material and P-type thermoelectric material, respectively.

[0047] S2, arrange the thermoelectric particles into the positioning mold 3; arrange them in an alternating order of N-type thermoelectric particles 1 and P-type thermoelectric particles 2. A sinking groove 4 is provided on the positioning mold 3, and several positioning grooves 5 are provided at the bottom of the sinking groove 4. Each positioning groove 5 corresponds to a thermoelectric particle, and the positioning grooves 5 and thermoelectric particles are adapted to each other. A lifting block 6 is provided at the bottom of the positioning groove 5, and a lifting plate 7 is provided below the positioning mold 3. The lifting block 6 is connected to the lifting plate 7 via a connecting rod 8; the lifting plate 7 is connected to the extension rod of the lifting piston cylinder 9, and the lifting piston cylinder 9 drives the lifting plate 7 to move up and down. When the lifting block 6 is in a low position, there is a gap between the upper end of the lifting block 6 and the opening of the positioning groove 5. When the lifting block 6 is in a high position, the upper surface of the lifting block 6 is not lower than the bottom surface of the sinking groove 4. S2, the thermoelectric particles are placed into the positioning grooves 5; at this time, the lifting block 6 is in a low position, the lower part of the thermoelectric particles is placed in the positioning grooves 5, and the lower end of the thermoelectric particles is supported on the lifting block 6.

[0048] S3. A heat-resistant fixing liquid is poured into the positioning mold 3. After solidification, the heat-resistant fixing liquid forms a semi-finished product 10. The heat-resistant fixing liquid is gypsum liquid. The refractory temperature of gypsum can reach over 1000 degrees Celsius. After solidification, the gypsum liquid fixes the thermoelectric particles, making the product have high temperature resistance. After the heat-resistant fixing liquid is poured in S3, the lifting piston cylinder 9 drives the lifting plate 7 to move. The lifting plate 7 rises and pushes the thermoelectric particles up through the lifting block 6, so that the thermoelectric particles are completely immersed in the heat-resistant fixing liquid. A positioning groove 5 adapted to the thermoelectric particles is set in the sinking tank 4. The thermoelectric particles are placed in the positioning groove 5. During the pouring of the heat-resistant fixing liquid, the thermoelectric particles in the positioning groove 5 will not move, ensuring the accuracy of the position. Before the heat-resistant fixing liquid solidifies, the lifting plate 7 rises upward, pushing the lifting block 6 upward, thereby pushing the thermoelectric particles away from the positioning groove 5, so that the thermoelectric particles are completely immersed in the heat-resistant fixing liquid, ensuring that the thermoelectric particles are reliably positioned in the fixing liquid. After the solidified semi-finished product 10 is removed from the positioning mold 3, the lifting plate 7 and the lifting block 6 return to their original positions.

[0049] S4. Processing the surface of semi-finished product 10 to expose the end faces of the thermoelectric particles: Grinding or milling is used to process the surface of semi-finished product 10 to remove excess heat-resistant fixing liquid, thereby exposing the end faces of the thermoelectric particles to facilitate subsequent connection of the thermoelectric particles. After S4, electrode patches are attached to the surface of semi-finished product 10. The electrode patches are plaster electrode patches, which are prepared by mold and then attached to the surface of semi-finished product 10 with water to facilitate the electrical connection of the thermoelectric particles.

[0050] S5, welding frames 11 are connected to both sides of the semi-finished product 10 to form a welding body 15. The welding frames 11 are made of gypsum material. The welding frames 11 are attached to the surface of the semi-finished product 10 with water. Several grooves 12 are set on the welding frames 11. Molten ZnAl welding paste is poured into the grooves 12 to achieve welding between thermoelectric particles.

[0051] During welding, the welding body 15 is clamped onto the positioning frame 16 for welding. The positioning frame 16 includes two opposing active rotating bars 17 and driven rotating bars 18. Each of the active rotating bars 17 and driven rotating bars 18 has a clamping groove 19 on its opposing surface, the width of which matches the edge thickness of the welding body 15. Both the active rotating bars 17 and driven rotating bars 18 are rotatably mounted on a support frame 20. A rotating motor 21 is mounted on the support frame 20. The rotating motor 21 drives the active rotating bars 17 to rotate. The two sides of the welding body 15 are clamped in the clamping grooves 19 of the active rotating bars 17 and driven rotating bars 18, respectively. Molten ZnAl solder paste is poured into the groove 12 on the upper welding frame 11 for welding. After cooling, the rotating motor 21 drives the positioning frame 16 to rotate 180 degrees, and then molten ZnAl solder paste is poured into the groove 12 on the other welding frame 11 for welding. After cooling, the welded body 15 is removed, and the outer surface of the welded frame 11 is processed to remove excess solder paste. The surface of the welded frame 11 is processed by grinding or milling.

[0052] A drive shaft 22 is mounted on the active tilting bar 17, and a driven shaft 23 is mounted on the driven tilting bar 18. The drive shaft 22 and driven shaft 23 are coaxially arranged and rotatably connected to the support frame 20. A driven gear 24 is mounted on the drive shaft 22, and a drive gear 25 is mounted on the output shaft of the tilting motor 21. The drive gear 25 meshes with the driven gear 24 for transmission. A torsion spring is installed between the driven shaft 23 and the support frame 20. A limiting protrusion is provided on the support frame 20, and a sliding groove is provided on the driven shaft 23. The limiting protrusion is placed in the sliding groove. When the limiting protrusion abuts against the end of the sliding groove, the driven tilting bar 18 is in a horizontal position. The torsion spring, limiting protrusion, and sliding groove ensure that the driven tilting bar 18 can return to the horizontal position.

[0053] A clamping space is formed between the active flipping bar 17 and the driven flipping bar 18. The weldment 15 is placed in the clamping space. A guide platform 26 is provided at the edge of the support frame 20. The edge of the guide platform 26 is close to the clamping space. The width of the clamping space gradually increases at one end towards the end direction. The width of the clamping groove 19 also gradually increases at one end towards the end direction, which facilitates the insertion of the weldment 15 between the two clamping grooves 19. One end of the clamping groove 19 is closed to prevent the weldment 15 from slipping out of the clamping groove 19 during the flipping process.

[0054] In this application, a protective layer is attached to the surface of the thermoelectric material, which protects the thermoelectric material and improves its thermoelectric performance. After the thermoelectric particles are aligned, a heat-resistant fixing liquid is poured in. After the heat-resistant fixing liquid solidifies, it positions the thermoelectric particles, ensuring the accuracy of their position. Moreover, the heat-resistant fixing liquid is resistant to high temperatures, enabling the thermoelectric power generation device to withstand higher temperatures, thereby improving power generation efficiency. Molten ZnAl solder paste is poured into the groove 12 to achieve welding between the thermoelectric particles. The high melting point of ZnAl solder helps to improve the product's temperature resistance, increase the product's temperature difference, and improve the product's power generation efficiency and adaptability.

[0055] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. A method for manufacturing a thermoelectric power generation device, characterized in that, Includes the following steps: S1. Attach a protective layer to the surface of the thermoelectric material and cut the thermoelectric material to form thermoelectric particles; S2. Arrange the thermoelectric particles in a positioning mold; S3. Pour a heat-resistant fixing liquid into the positioning mold, and the heat-resistant fixing liquid solidifies to form a semi-finished product; S4. Process the surface of the semi-finished product to expose the end faces of the thermoelectric particles; S5. Connect welding frames to both sides of the semi-finished product, and set several grooves on the welding frames. Pour molten ZnAl solder paste into the grooves to achieve welding between the thermoelectric particles.

2. The method for manufacturing a thermoelectric power generation device according to claim 1, characterized in that, After S4, electrode patches are attached to the surface of the semi-finished product.

3. The method for manufacturing a thermoelectric power generation device according to claim 1, characterized in that, The protective layer consists of a nickel layer and an aluminum layer, with the aluminum layer covering the nickel layer.

4. The method for manufacturing a thermoelectric power generation device according to claim 3, characterized in that, Nickel layer thickness 10-100μm; aluminum layer thickness 10~200μm.

5. The method for manufacturing a thermoelectric power generation device according to claim 1, characterized in that, A sinking trough is set on the positioning mold, and several positioning slots are set at the bottom of the sinking trough. The positioning slots are compatible with thermoelectric particles. A lifting block is set at the bottom of the positioning slot, and a lifting plate is set below the positioning mold. The lifting block is connected to the lifting plate through a connecting rod. S2 The thermoelectric particles are placed in the positioning slot. S3 After the heat-resistant fixing liquid is poured out, the lifting plate is raised and the lifting block pushes the thermoelectric particles to rise so that the thermoelectric particles are completely immersed in the heat-resistant fixing liquid.

6. The method for manufacturing a thermoelectric power generation device according to claim 1, characterized in that, S4 uses grinding or milling to process the surface of the semi-finished product.

7. The method for manufacturing a thermoelectric power generation device according to claim 1, characterized in that, The heat-resistant fixing solution is gypsum solution.

8. A method for manufacturing a thermoelectric power generation device according to any one of claims 1 to 7, characterized in that, The protective layer is attached to the surface of the thermoelectric material using any of the following processing methods: dip plating, electroplating, spraying, or sputtering vacuum plating.

9. A method for manufacturing a thermoelectric power generation device according to any one of claims 1 to 7, characterized in that, The thermoelectric material is any one of bismuth telluride, lead telluride, or tin selenide.

10. A method for manufacturing a thermoelectric power generation device according to any one of claims 1 to 7, characterized in that, The welding frame is made of gypsum board.

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